#include<iostream>
#include<cstdio>
#include<cstring>
#include<string>
#include<cctype>
#include<cstdlib>
#include<algorithm>
#include<bitset>
#include<vector>
#include<list>
#include<deque>
#include<queue>
#include<map>
#include<set>
#include<stack>
#include<cmath>
#include<sstream>
#include<fstream>
#include<iomanip>
#include<ctime>
#include<complex>
#include<functional>
#include<climits>
#include<cassert>
#include<iterator>
using namespace std;

int a;
int b;
int c;

int main(){
	cin >> a >> b;
	long long int ans = 0;
	if (b < a){
		ans += abs(a - b) - 1;
		ans += 2000000000 - a;
		printf("%lld\n", ans);
	}
	else{
		ans += abs(b - a) - 1;
		ans += a - 1;
		printf("%lld\n", ans);
	}
	return 0;
}